Improvement in hoisting-machines



SAMUEL 1".. LORD, OE NEw YORK, N. Y.

IMPROVEMENT IN HOlSTlNG-MACHINES.

Specification forming part of/Letters Patent No. 121,113, dated November 21, 1871.

To all whom it may concern:

Be it known that I, SAMUEL L. LORD, of the city, county, and State of New York, have invented certain Improvements in Hoisting-Machine, and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification.

The obj ect of this invention is to furnish a convenient portable machine for raising heavy weights-one which shall give a slow motion for raising heavy weights, and a quick motion for raising light weights, or unwinding the rope or chain, and it consists in the construction, arrangement, and combination of parts, hereinafter described.

In the accompanying drawing, Figure 1 is a sectional elevation of the machine. Fig. 2 is a vertical section looking from the line .fr .n of Fig. 1 in the direction indicated by the arrow 1. Fig. 3 is a vertical section looking to the right from the line y y of Fig. 1. Fig. 4 is a vertical section of Fig. 1 looking from the line z z, as indicated by the arrow 2. Fig. 5 is a vertical section looking from z z, as indicated by the arrow 3.

Similar letters of reference indicate corresponding parts. y

A is a portable frame, consisting of a bedpiece, B, and two stands, C and D. E is the drum or windlass, on which is the internal gearwheel F. Gr is the crank-shaft, which passes through the drum and through the ratchet-wheel H. I is a pinion-wheel, which is fast on the shaft G. J is a pinion-wheel, which is pivoted to the inside of the ratchet-wheel H. This pinion J meshes into the gear-wheel F. The two p inions I and J mesh together. k is a pawl on the inside of the ratchet-wheel, which engages with the pinion J and prevents the pinion turning or revolving on its own center in one direction, but slips over the cogs and allows it to revolve in the other direction. `L is a pawl attached to the stand C, which engages with the ratchet-wheel H and holds the wheel stationary when the crank N is turned in one direction, but slips over the ratchet-teeth when the crank is turned in the other direction.

When the crank is turned to the right (or for lifting a heavy weight) the ratchet-wheel is held stationary by the pawl L, and the windlass is turned by means of the pinion I. The other pinion, J, turns on its own center, and acts simply as an intermediate gear between the pinion I and the gear-wheel F. This produces a slow motion compared with the motion of the crank-shaft,

' and the power is increased in proportion. When the shaft is turned in the other direction the small pawl 7.a prevents the pinion J from revolving. The pawl L slips over the teeth` of the ratchet-wheel, and the whole apparatus revolves together with the crank-shaft, thus greatly facilitating the raising of light weights and unwinding the rope or chain.

O is a friction-strap binder, for regulating the motion of the windlass. This binder is operated or applied by means of the lever P and pulley q.

This hoisting-machine is designed for hoisting stone and other materials in the erection of buildings, and may be moved from place to place for hoisting weights in all situations. The motion is made slow with greatly-increased power, or fast with diminished power, by turning the same crank in opposite directions. The machine is thus adapted to raising heavy or light weights, and for the various purposes for which hoistingmachines are required.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- A compound machine for hoisting light or heavy weights, consisting of parts F Gr H I J, when combined to operate in the manner described.

The above specification of my invention signed ALEX. F. ROBERTS,

FRANK BLOOKLEY. p (79) 

